Apparatus for spraying annular articles



Mm 22, 1932; v c; E, MAYNARD 1,850,238

APPARATUS FOR SPRAYING ANNULAR ARTICLES Filed May 51, 1929 4Sheets-Sheet I /6 i 23 ii A INVENTOR. 4 chm-lea Edgar Mayn rd- Q BYATTORNEY.

March 22, 1932. c. E. MAYNARD 1,350,238

APPARATUS FOR SPRAYING ANNULAR'ARTICLES Filed May 31, 1929 4Sheets-Sheet 2 INVENTOR. GhOr'lbS Edgar Maynard.

ATTORNEY.

March 22, 1932. c, E, MAYNARD 1,850,238

APPARATUS F011 SPRAYING ANNULAR ARTICLES Filed May 31, 19294'Sheets-Sheet 3 INVENTOR.

Char-IQ: Ddgavf Maynard.

,Qrroamsv.

March 22, 1932. c. E. MAYNARD APPARATUS FOR SPRAYING ANNULAR ARTICLES IFiled May 31, 1929 4 Sheets-Sheet 4.

. .72: Am ,svppz'y INVENTOR;

a Hal-I03 Edgar Maynard ATTORNEY.

Patented Mar. 22, 1932 UNITED STATES PATENT OFFICE CHARLES EDGARMAYNARD, OF TIORTHAMPTON, MASSACHUSETTS, ASSIGNOR TO THE A FISK RUBBERCOMPANY, CHICOPEE FALLS, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTSAPPARATUS FOR SPBAYING ANNULAB ARTICLES Application filed May 31, 1929.Serial No. 367,578.

bearings bolted to the underside of plate 14.

My invention relates to machines for spraying liquids and moreparticularly to a machine for spraying liquids on annular articles suchas tires for vehicles. The object b of my invention is to provide amachine which will be substantially automatic in operation and also toprovide a machine which will spray a tire rapidly and evenly.()therobjects will be apparent from the specification and claims.

Referring to the drawings which show one embodiment of myinvention,

Fig. 1 is a plan view of the machine in operating position;

Fig.2 is a side View of the machine shown inFig.1;,

Fig. 3 .is a view taken on line 3-3 of Fig.

1, but on a larger scale;

Fig. 4 is a sectional view taken .on line 4-4 so of Fig. 3;

I Figs. 5, 6 and 7 are detail views of certain of the timing uni-t partsshowing their operating movements;

F1 8 is a sectional view taken on line 88 25 of Fig. 1;

' Fig. 9 is a partial side view showing the inoperative position; and

Fig. 10 is a diagrammatic view showing the piping connections for thevarious parts. In the drawin s 11 represents a base on which isverticalFy mounted a two-way cylinder 12, the piston rod 13 of which issecured, as shown in Fig. 8, to a plate 14. A

guiding rod 15, which is also secured to the plate 14, is slidablypositioned in a lug 16 formed on the cylinder 12 to prevent any rotationof the late 14. The piston rod 13 extends throug both ends of thecylinder so that. when the cylinder is operated the plate 14 will beraised or lowered within the limits of the cylinder and will besubstantially rigid in any position.

Mounted on the plate 14 is an electric motor 17, see Figs. 1 and 3,which bears a pinion 18 meshing with a gear 19 keyed to a shaft 20 whichin turn runs in a bearing 21 bolted to the plate 14. A sprocket. 22isalso keyed to the shaft 20 and meshes with a chain 23 to tively keyedto shafts 26 and 27 running in drive sprockets 24 and 25 which arerespec-.

As shown in Figs. 1 and 8, the shafts 26 and 27 extend beyond the plate14 and are formed with collars 30 to position a tire casing 31. Themotor 17 acting through gears 18 and 19, sprocket 22, chain 23 andsprockets 24 and 25 serves to continuously rotate the shafts 26 and 27in the direction of the arrows shown in Figs. 2 and 9, and the tirecasin 31 supported by these shafts will be rotate in the direction ofthe arrows shown inFigs. 1 and 2.

Vertically mounted in a base 32 is a post 33 on which is mounted abracket 34. Bolted to the latter is an arcuate member 35 su porting apipe 36 in the shape of a hal ring.

Connected to the pipe 36 are four air oper-' ated spray nozzles 37'which may be of a type commercially available so theirdetailedconstruction-isnot shown in the drawings. Concentricallypositioned in respect to the pipe 36 is another pipe 38 used to su plycompressed air to the spray nozzles 3 A pi 39 leads from the pipe 36 tothe bottom 0 a V supply tank '40 supported on a bracket 41 journ'aled tothe post 33. The half ring pipes 36 and38 and the connected spraynozzles 37 are so positioned in respect to the tire casing. 31 that thehorizontal section of the latter is centered in the half ring pipes sothat when compressed air is introduced into the pipe 38 it will drawliquid 42 from the supply tank 40, into pipe 39, pipe 36, and into thespray nozzles 37, and spray the tire as shown in Fig. 1. Sometimes theliquid to be. sprayed is of thick consistency so that if certainprecautions are not taken the apparatus may become clogged. To, overcomethis I have placed a strainer 43 over the opening of pipe 39 into thesupply tank 40 and provided an agitator 44 'com rising twointerconnected lengths of pin oled pipe placed at the bottom of the tank40. A connection 45 in which is a regulating valve 46 suppliescompressed air to the agitator thus permitting the operator to keep theliquid 42 HI'B and controlling unit comprising a crank 47 Aeccentrically mounted to the Shift 26 (Fi 3) and linked to an arm 48keyed to a sha 49 mounted in bearings 50 bolted to. the plate 14. Alsokeyed to the shaft 49 is another arm 51 at the end of which is pivoted apawl '52. It will be evident from the foregoing that the crank 47 willact to continuously oscillate the pawl 52 as shown by the arrows anddotted position in Fig. 5. Mounted on the shaft 49 so as to be free]rotatable is a ratchet wheel 53 positioned to e acted upon by the pawl52. This ratchet wheel has a tooth 54 which is double size so that whenthis tooth is under the pawl 52 the pawl will not index the ratchetwheel, but if the latter is slightly rotated the pawl will engage thenext regular size tooth and then index the ratchet wheel through onerevolution and when the double size tooth is a ain stop an er the pawl.Pinned to the ratchet w eel it against a stop 61 fixed in a support 62by a set screw 63. Asis shown in Figs. 5, 6 and 7, the lever 58 ispositioned to enga e, when the plate 14 is raised by the cylln or 12, astriker 64 adjustably secured to a st 65 which passes through a hole inthe p ate 14 and is attached to the cylinder 12.- When this occurs thestriker 64 will rotate the lever 58 against the spring 60, as shown inFig. 6, to index the ratchet wheel one tooth in the direction of thearrow. Immediately the continuously oscillating pawl52 will index theratchet wheels 53 around to complete one revolution and then the doubletooth 54 comes under the pawl 52 again to stop the rotation. This causesthe cam 55 to hold the valve 57 open during the time required to makethe one revolution. The position of the parts after this revolution isshown in Fig. 7 and when the plate.14 is lowered the lever 58 leaves thestriker 64 and the'spring 60 will returnthe lever back to stop 61 sothat when the late 14 is a ain raised the operations will he repeated. yrotating the setting of stop '61 180 from the position shown in Figs. 5,6 and 7 the pawl 59 may be made to index the ratchet wheel ahead twoteeth each time thus shortenin the open period of the valve during eaccycle of operation.

The admission of compressed air to the pneumatic cylinder 12 is underthe control of a main valve 66, the connections to which are illustrateddiagrammaticall in detail in Fig. 10. The valve is compose of plungers.has another connection 76 leadin mounted on the ventionally onl in thedrawings as the valve is of a standar commercial type. Plun ers 67 and68, and 69 and 70, are connectc so .that they operate in pairs, the twopairs being simultaneously actuated in opposite directions.

Thus when the valves 67 and 68 are 0 en valves 69 and 70 are closed orvice versa. eadin to an air supply connection 45 is a connection 71which leads tovalve 67 and by a branch connection 72 to valve 70.Connections 73 and 74, res ectively, lead from the valves 68 and 69 to te top and bottom of the cylinder 12. It will be noted that the valves 68and 69 are connected to an exha'ust.

Also connected to the air supply line 45 1s a'connection leading to thevalve 57 which h to ghe air suppl pipe 38 of t e s ray nozz es 3 Asshown in Fig. 9, when the machine is inoperative the plate 14 carryingthe contin uously rotated shafts 24 and 25 is in the down position andthe operations of the machine to spray a tire are as follows: A tire 31is positloned over the shafts 26 and 27 and the valve 66 is operated todepress the plungers 67 and 68, thus admitting compressed. air fromconnection 71 to connection 74 and into the bottom of cylinder 12 andopening the top of the cylinder to the exhaust through the connection 73and past plunger 68. This causes the cylinder to raise the plate 14 andall the apparatus carried on it. The continuously rotated shafts 26 and27 engage the .beads of the tire casing 31 and raise it from the floorand at the sametime rotate it. Just before the plate 14 reaches itsuppermost limit which is, of course, the limit of the cylinder 12, thelever 58 of the timing and controllin unit is acted upon b the striker64 to cause t e pawl 59 to index a ead the ratchet wheel one tooth,

thus causing the cam 55 to open the valve 57 which admits compressed a1rinto the pipe 38 causing, as was previously described, the

spray nozzles 37 to draw the liquid 42 from the tank 40, into connection39 and pipe 36 and'spray the tire 31. This spraying lasts as long as ittakes the continuously oscillating pawl 52 to index the ratchet wheel 53to complete the one revolution when the cam 55 allows the valve 57 toclose. It will be understood that the speed of the shafts 26 and 27 issuch that the tire 31 will make at least one revolution during thisspraying period. Immediately after the spraying stops the operatorreverses the valve 66 to close the plungers 67 and 68 and open theplungers 69 and 70, thus admitting compressed air to the top of thecylinder 12 by connections 71, 72 and 73 and exhausting the bottomthrough connection 74 and past plunger 69. This causes the cylinder tolower the plate 14 and shafts 26 and 27, thus tion.

depositin the tire 31 back on the floor as shown in%ig. 9.

Having thus described my invention, I claim:

1. A device for painting tire casings which comprises a movable supportadapted to retate a tire casing paint spraylng means, means to move s a1support to position the tire casing in operative relation with thespraymg means, a timing niechamsm, means associated with said supportadapted to initi ate the operation of said timing mechanism to admitfluid pressure to the paint spraying means, said timing means beingoperative after a predetermined time to shut ofi the fluid presure.

2. In a device of the character described a timing unit comprising aratchet wheel having an inoperative portion, a cam formed on the ratchetwheel, a valve, the plun er of which engages the cam, the said cam aapted to close the valve at one place on its perlphery, a continuouslyoscillating, awi engaging the ratchet wheel to index 1: e latter exceptwhen the inoperative portion is under the pawl, the valve closingportion of the cam being so positioned that the valveis closed when theinoperative portion of the ratchet wheel is under the pawl, and means 7operable to move the ratchet wheel ahead te I disengage the pawl fromthe inoperative portion of the ratchet wheel to initiate the retation ofthe ratchet and cam, the cam operating'to hold the valve open duringthis rota- CHARLES EDGAR MAYNARD.

